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A ZigBee module presentation as a part of one complete course about using communication modules along with PIC-Micro-controller

A ZigBee module presentation as a part of one complete course about using communication modules along with PIC-Micro-controller
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    ZigBee module ZigBee module Presentation Transcript

    • Instructor: Mohsen Sarakbi ZigBee Module Communication PIC-Microcontroller Lab Course by JAOM Center, Feb. 2013
    • ZigBee Definition  Based on IEEE 802.15.4 Standard (Addressing)  Designed for sensor and control networks  Used for applications that require:  Low Power Consumption  Low Data Rate  Network Security
    • Wireless Comparison
    • ZigBee Layers
    • ZigBee Layers  Two lower layers, the physical layers (PHY) and the media access layer (MAC) are defined by the IEEE 802.15.4 specification.  The PHY deals with the implementation of the direct sequence spread spectrum (DSSS) radio hardware in 2.4GHz band  The MAC handles access to the PHY layer.  Network Layer;Ad-hoc  The above layers are defined by the ZigBeeAlliance, except the application layer which is defined by the end user.
    • ZigBee Layers
    • ZigBee Network
    • ZigBee Network  Coordinator : One coordinator exists in each network. • Each network has 1 coordinator • Coordinator selects channel and PAN ID • Other devices then join the PAN • Usually powered by something stable • 16-bit address is always 0 • Assigns 16-bit address for the router and end devices
    • ZigBee Network  Routers: Many routers exist in each network. • Optional • Often powered by something stable • Can have as many as you want • Issues a request on startup to find a coordinator/network it can join • Can talk to any device • If an end device is sleeping it stores its data • Coordinator can act as a “super router”
    • ZigBee Network  End Devices: Many end devices exist in each network.  Usually battery powered  They sleep most of the time and wake up regularly to collect and transmit data.  Devices such as sensors are configured as end devices.  They are connected to the network through the routers.  Can have as many as you want
    • XBEE Module
    • XBEE Features  www.digi.com  802.15.4 / Multipoint network topologies  2.4 GHz for worldwide deployment  900 MHz for long-range deployment  Low-power sleep modes  Multiple antenna options
    • XBEE Chip
    • Regular vs. Pro XBEE XBEE Pro Power 1-2mW 50-60mW Size Smaller Larger Range Shorter range (100m) Longer range (300m) Cost Cheaper More expensive
    • XBEE Addressing • Channels • PAN ID • 64-bit address • High -0013A200 same for all XBees • Low – each XBee has its own address • 16-bit address (Series 1 only)
    • ZBEE Point-to-Point
    • XBEE Firmware • Must upload with X-CTU (onWindows) • AT Commands
    • XBEE Configuration
    • Command Mode  +++ gets you into command mode  1 second delay on either side  No <enter>  Should get “OK” back  Times out after 10 seconds • Commands use Hexadecimals • Always Press Enter
    • AT Commands • AT – just returns an “OK” • ATMY – 16- bit address (Series 1 only) • ATDH – 64-bit destination address high bits • ATDL – 64-bit destination address low bits • ATID – PAN ID • ATCN – end command mode • ATRE – reset all settings • ATWR – write settings to flash  ATBD followed by 0-7 depending on the BaudRate you want  0 = 1200, 1 = 2400, 2 = 4800, 3 = 9600, 4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200
    • AT Commands
    • ZBEE Point-to-Point  A peer-to-peer network can be established by:  configuring each module to operate as an End Device (CE = 0)  disabling End DeviceAssociation on all modules (A1 = 0)  setting ID and CH parameters to be identical across the network.
    • Unicast Mode  ZBEE 16-bit Address  Short 16-bit addresses.The module can be configured to use short 16-bit addresses as the Source Address by:  Setting (MY < 0xFFFE).  Setting the DH parameter (DH = 0) will configure the DestinationAddress to be a short 16-bit address (if DL < 0xFFFE).  For two modules to communicate using short addressing, the DestinationAddress of the transmitter module must match the MY parameter of the receiver.
    • Unicast Mode  ZBEE 64-bit Address  Long 64-bit addresses.The RF module’s serial number (SL parameter concatenated to the SH parameter) can be used as a 64-bit source address when the MY (16- bit Source Address) parameter is disabled.When the MY parameter is disabled (MY = 0xFFFF or 0xFFFE), the module’s source address is set to the 64-bit IEEE address stored in the SH and SL parameters.
    • Broadcast Mode  One to All  Any RF module within range will accept a packet that contains a broadcast address.  To send a broadcast packet to all modules regardless of 16-bit or 64-bit addressing.  Sample Network Configuration (All modules in the network):  DL (Destination LowAddress) = 0x0000FFFF  DH (Destination High Address) = 0x00000000
    • Lab  X-CTU  XBEE to XBEE connection (without PIC)  16-bit & 64 bit  Broadcast  Using PIC for an application